Bug 219193

just to add on that i tested this in:

1. Ubuntu 24.04
2. Fedora 40
3. Fedora 41

i will try Arch tomorrow and report.

Bisecting would be nice: https://docs.kernel.org/admin-guide/bug-bisect.html

thank you for the suggestion but i do not have programming background and i think it is too difficult for someone like me to debug the code.

what i can confirm is that:

6.9.12 is working correctly.
6.10-rc1 onward will have black screen and HDMI not detecting any output, and lspci -nnk show that the VGA is not loading any of the kernel driver.

Bisection does not require any programming background.

You basically run two commands:

git bisect
make

That's it.

On the other hand you may continue to experience this problem indefinitely from now on.

FWIW, here is a more detailed guide on bisecting: https://docs.kernel.org/admin-guide/verify-bugs-and-bisect-regressions.html

I did tried the bisecting for the past few days, but the compiler had stopped with some error that i dont know how to resolve.... each "make" took about an hours and there is 13 steps (compile) to go... i only have few hours a day to try this...

any with my best effort i had run few bisecting, and below is the result so far and the compiler had been crashed. can i just resume the bisect from the last known good and bad commit? because when i tried that it said 13 steps to go....

git bisect start
# status: waiting for both good and bad commits
# bad: [1613e604df0cd359cf2a7fbd9be7a0bcfacfabd0] Linux 6.10-rc1
git bisect bad 1613e604df0cd359cf2a7fbd9be7a0bcfacfabd0
# status: waiting for good commit(s), bad commit known
# good: [a38297e3fb012ddfa7ce0321a7e5a8daeb1872b6] Linux 6.9
git bisect good a38297e3fb012ddfa7ce0321a7e5a8daeb1872b6
# bad: [db5d28c0bfe566908719bec8e25443aabecbb802] Merge tag 'drm-next-2024-05-15' of https://gitlab.freedesktop.org/drm/kernel
git bisect bad db5d28c0bfe566908719bec8e25443aabecbb802
# good: [b850dc206a57ae272c639e31ac202ec0c2f46960] Merge tag 'firewire-updates-6.10' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394
git bisect good b850dc206a57ae272c639e31ac202ec0c2f46960
# good: [afd29f36aaf733985df1ba162424581b8b8853b4] net: pcs: lynx: no need to read LPA in lynx_pcs_get_state_2500basex()
git bisect good afd29f36aaf733985df1ba162424581b8b8853b4
# bad: [8e6a3116e3b5d62a76577f330d535739a33980e1] drm/amd/display: Code style adjustments
git bisect bad 8e6a3116e3b5d62a76577f330d535739a33980e1
# good: [34633158b8eb8fca145c9a73f8fe4f98c7275b06] Merge tag 'amd-drm-next-6.10-2024-04-13' of https://gitlab.freedesktop.org/agd5f/linux into drm-next
git bisect good 34633158b8eb8fca145c9a73f8fe4f98c7275b06
# bad: [fad3dad8326df56aff216af4630505180bc2a27d] Merge tag 'drm-intel-next-2024-04-17-1' of https://anongit.freedesktop.org/git/drm/drm-intel into drm-next
git bisect bad fad3dad8326df56aff216af4630505180bc2a27d
# good: [26410896206342c8a80d2b027923e9ee7d33b733] drm/i915/bios: Tolerate devdata==NULL in intel_bios_encoder_supports_dp_dual_mode()
git bisect good 26410896206342c8a80d2b027923e9ee7d33b733
# bad: [6809f9246d43f7cb07310ca6a3deb7aa1c0ea938] drm/i915/hdcp: Fix get remote hdcp capability function
git bisect bad 6809f9246d43f7cb07310ca6a3deb7aa1c0ea938
# bad: [b648ce2a28ba83c4fa67c61fcc5983e15e9d4afb] drm/i915/mst: Reject FEC+MST on ICL
git bisect bad b648ce2a28ba83c4fa67c61fcc5983e15e9d4afb
# good: [26410896206342c8a80d2b027923e9ee7d33b733] drm/i915/bios: Tolerate devdata==NULL in intel_bios_encoder_supports_dp_dual_mode()
git bisect good 26410896206342c8a80d2b027923e9ee7d33b733
# status: waiting for bad commit, 1 good commit known
# bad: [b648ce2a28ba83c4fa67c61fcc5983e15e9d4afb] drm/i915/mst: Reject FEC+MST on ICL
git bisect bad b648ce2a28ba83c4fa67c61fcc5983e15e9d4afb
# good: [6cdebf62a159f31351946685b02941c968b96e49] Merge tag 'spi-v6.9' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
git bisect good 6cdebf62a159f31351946685b02941c968b96e49

ok finally manage to complete the bisect, here the result, hope this help

git bisect bad
1965dbd535eec6064803484eb014a2d9a0cf6a30 is the first bad commit
commit 1965dbd535eec6064803484eb014a2d9a0cf6a30
Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date:   Tue Mar 19 11:24:43 2024 +0200

    drm/i915/bios: Use the platform's port_mask when there is no VBT

    When we have no VBT we currently assume ports A-F are
    all pontially valid for every platform. That is nonsense.
    Grab the bitmask of valid ports from the runtime info
    instead.

    Although the defaults we actually fill here look semi-sensible
    only for hsw-skl era hardware. Dunno if we should try to do
    something more appropriate here for other platforms,
    or just try to nuke the whole thing?

    Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
    Link: https://patchwork.freedesktop.org/patch/msgid/20240319092443.15769-2-ville.syrjala@linux.intel.com
    Reviewed-by: Jani Nikula <jani.nikula@intel.com>

 drivers/gpu/drm/i915/display/intel_bios.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)



**************

git bisect log
git bisect start
# status: waiting for both good and bad commits
# good: [a4c5a457c6107dfe9dc65a104af1634811396bac] perf/arm-dmc620: Fix lockdep assert in ->event_init()
git bisect good a4c5a457c6107dfe9dc65a104af1634811396bac
# status: waiting for bad commit, 1 good commit known
# bad: [4853f1f6ace32c68a04287353e428c4cfc3fa8ed] Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rmk/linux
git bisect bad 4853f1f6ace32c68a04287353e428c4cfc3fa8ed
# good: [54e1a2aa61a7bf4af2799baf7ab2dc2712844245] Merge branch 'for-next/tlbi' into for-next/core
git bisect good 54e1a2aa61a7bf4af2799baf7ab2dc2712844245
# good: [54e1a2aa61a7bf4af2799baf7ab2dc2712844245] Merge branch 'for-next/tlbi' into for-next/core
git bisect good 54e1a2aa61a7bf4af2799baf7ab2dc2712844245
# good: [b850dc206a57ae272c639e31ac202ec0c2f46960] Merge tag 'firewire-updates-6.10' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394
git bisect good b850dc206a57ae272c639e31ac202ec0c2f46960
# good: [46c6d2b186915176be5acc5d4b6f9793eb32a0c7] Merge tag 'asymmetric-keys-next-6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd
git bisect good 46c6d2b186915176be5acc5d4b6f9793eb32a0c7
# bad: [d34672777da3ea919e8adb0670ab91ddadf7dea0] Merge tag 'fbdev-for-6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/linux-fbdev
git bisect bad d34672777da3ea919e8adb0670ab91ddadf7dea0
# bad: [377b5b397d073c0aae36b833a5bcac0e6f349243] Merge tag 'amd-drm-next-6.10-2024-04-19' of https://gitlab.freedesktop.org/agd5f/linux into drm-next
git bisect bad 377b5b397d073c0aae36b833a5bcac0e6f349243
# good: [81bf14519a8ca17af4f057a125d87fabbae90af3] drm/amdkfd: make sure VM is ready for updating operations
git bisect good 81bf14519a8ca17af4f057a125d87fabbae90af3
# bad: [8f6372a4d69045b8a7dd371bd3c269ad1bf85e08] drm/i915/mtl: Add DP FEC BS jitter WA
git bisect bad 8f6372a4d69045b8a7dd371bd3c269ad1bf85e08
# good: [48ba4a6dc3876f87090ccfe942c6d8325f49e11c] drm/i915: Update IP_VER(12, 50)
git bisect good 48ba4a6dc3876f87090ccfe942c6d8325f49e11c
# bad: [8d7fc2612e4a161a63ed6cddcfe8d3205717b54d] drm/i915: Extract intel_dbuf_mbus_join_update()
git bisect bad 8d7fc2612e4a161a63ed6cddcfe8d3205717b54d
# bad: [71cdfa8cad300caa7afcbba09776bbc8dcfa9e39] drm/i915/psr: Do not write ALPM configuration for PSR1 or DP2.0 Panel Replay
git bisect bad 71cdfa8cad300caa7afcbba09776bbc8dcfa9e39
# bad: [f3b899f0b4b17fa0b20e27c23f78604d5686383d] drm/i915/psr: Calculate PIPE_SRCSZ_ERLY_TPT value
git bisect bad f3b899f0b4b17fa0b20e27c23f78604d5686383d
# good: [26410896206342c8a80d2b027923e9ee7d33b733] drm/i915/bios: Tolerate devdata==NULL in intel_bios_encoder_supports_dp_dual_mode()
git bisect good 26410896206342c8a80d2b027923e9ee7d33b733
# bad: [e580fc47b50c528b9a1210b0b6ef540d79c2cfa8] drm/i915: Delete stray .rej file
git bisect bad e580fc47b50c528b9a1210b0b6ef540d79c2cfa8
# bad: [92714006eb4d10ddfaa0eca41c81e6b483e02f93] drm/i915/backlight: Do not bump min brightness to max on enable
git bisect bad 92714006eb4d10ddfaa0eca41c81e6b483e02f93
# bad: [1965dbd535eec6064803484eb014a2d9a0cf6a30] drm/i915/bios: Use the platform's port_mask when there is no VBT
git bisect bad 1965dbd535eec6064803484eb014a2d9a0cf6a30
# first bad commit: [1965dbd535eec6064803484eb014a2d9a0cf6a30] drm/i915/bios: Use the platform's port_mask when there is no VBT

manual reverse the code in this commit confirm that now i have working HDMI in UHD730 passthrough VM in Proxmox. thanks for all helps.

i will email the commit author.

Please post here as well:

https://gitlab.freedesktop.org/drm/i915/kernel/-/issues

Follow-up at https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/12106