Created attachment 277609 [details] Linux 4.14.31 black screen patch Hi Since Linux 4.16.0 and since around LTS 4.14.31 I only get a black screen at boot. The screen worked with < 4.14.31 and 4.15.x. Using the attached patch (basically reverting changes that happened since 4.14.27) I could get 4.14.31 to work. Sadly these changes did neither work for 4.14.57 nor 4.17.10. Does anyone have hints on how to debug this further? Thanks.
I could boot 4.14.57 once with nouveau.modeset=1. But in all other cases it didn't even work with nouveau.modeset=0. Could this be a timing issue somewhere?
quote from the call trace: --- [ 118.291482] Disabling non-boot CPUs ... [ 118.321187] PM: Calling ledtrig_cpu_syscore_suspend+0x0/0x24 [ 118.326961] PM: Calling sched_clock_suspend+0x0/0x40 [ 118.331966] PM: Calling timekeeping_suspend+0x0/0x2bc [ 118.331966] PM: Calling irq_gc_suspend+0x0/0x80 [ 118.331966] PM: Calling fw_suspend+0x0/0x28 [ 118.331966] PM: Calling pxa_gpio_suspend+0x0/0x74 [ 118.331966] Unable to handle kernel NULL pointer dereference at virtual address 000000d0 [ 118.331966] pgd = 8e57fbdd [ 118.331966] [000000d0] *pgd=00000000 [ 118.331966] Internal error: Oops: 5 [#1] SMP ARM [ 118.331966] Modules linked in: ofpart m25p80 spi_nor mtd tegra_drm snd_soc_tegra_trimslice snd_soc_tegra_utils cec rc_core drm_kms_helper snd_soc_tegra20_i2s snd_soc_tlv320aic23_i2c snd_soc_tlv320aic23 snd_sa [ 118.331966] CPU: 0 PID: 656 Comm: systemd-sleep Tainted: G C 4.18.0-0.rc8.git0.1.tegra.fc28.armv7hl #1 [ 118.331966] Hardware name: NVIDIA Tegra SoC (Flattened Device Tree) [ 118.331966] PC is at pxa_gpio_suspend+0x20/0x74 [ 118.331966] LR is at syscore_suspend+0x140/0x270 [ 118.331966] pc : [<c070f270>] lr : [<c082a630>] psr: 600f0193 [ 118.331966] sp : c319bda8 ip : ffffffff fp : c319bdb4 [ 118.331966] r10: 00000004 r9 : c1304d80 r8 : c0e22934 [ 118.331966] r7 : c13efb20 r6 : c13efb20 r5 : c1397ccc r4 : 00000000 [ 118.331966] r3 : 00000000 r2 : 00000000 r1 : 00000007 r0 : 00000000 [ 118.331966] Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment none [ 118.331966] Control: 10c5387d Table: 2b73804a DAC: 00000051 [ 118.331966] Process systemd-sleep (pid: 656, stack limit = 0x21bb6793) ---
Sorry, wrong bug. That been said, you can have a look on https://bugzilla.kernel.org/show_bug.cgi?id=198399 There are similar problem with upstream iommu support on tegra https://github.com/grate-driver/linux/commit/7f0750065a31ae491278a8960c1aceb4a44b847f
This issue still exists in the latest 4.20-rc1. Any chance to get this fixed anytime soon? I mean, this issue is not just a minor regression, but makes the system completely unusable. Also, if there's anything I can do to speed up fixing the issue, I'm very happy to help.