Kernel Bug Tracker – Bug 25312
Blanked screen with 2.6.37-rc6, -rc5 works OK (bisected to 541cc966915b6756e54c20eebe60ae957afdb537)
Last modified: 2010-12-22 12:44:37 UTC
All mentioned computers run Fedora 14 x86_64 with KMS.
On my work machine with an Intel graphics chipset and a flat panel with working EDID, vanilla kernels 2.6.37-rc6 and 2.6.37-rc5 works OK.
On my home machine, with a somewhat different Intel graphics chipset, and a flat panel that does *not* report EDID information, 2.6.37-rc5 works OK but 2.6.37-rc6 blanks the KMS display on boot. I get the "no signal" message on the panel instead of a working display. I was able to bisect this to the following commit:
Author: Chris Wilson <email@example.com>
Date: Mon Dec 6 11:24:07 2010 +0000
drm: Don't try and disable an encoder that was never enabled
Prevents code that assumes that the encoder is active when asked to be
disabled from dying a horrible death.
Reported-by: Daniel Vetter <firstname.lastname@example.org>
Signed-off-by: Chris Wilson <email@example.com>
Signed-off-by: Dave Airlie <firstname.lastname@example.org>
When I revert this commit, the problem goes away in my home machine.
Created attachment 41012 [details]
lspci -vvvv on the affected machine.
Created attachment 41022 [details]
Kernel configuration used to compile affected kernel
Created freedesktop.org bug https://bugs.freedesktop.org/show_bug.cgi?id=32527
*** This bug has been marked as a duplicate of bug 25242 ***