|Summary:||2.6.31-rc3: LVDS gets re-enabled after resume|
|Component:||Driver/intel||Assignee:||Jesse Barnes <jbarnes>|
|Status:||RESOLVED FIXED||QA Contact:||Xorg Project Team <xorg-team>|
|i915 platform:||i915 features:|
Description pittipatti 2009-11-06 02:42:12 UTC
Created attachment 31008 [details] lspci -vnvn On my Samsung Q45 with Intel GM965 graphics I encounter the following problem when using KMS: After a suspend/resume cycle the internal LVDS always gets enabled, whether it was on before or not. State before suspend/resume: LVDS: off / VGA: 1600x1200 State after resuming from suspend: LVDS: 1280x800 / VGA: 1600x1200 "xrandr --query" reports that the LVDS is off and it is not possible to turn it off by issuing "xrandr --output LVDS --off" To finally turn the LVDS off it needs to be "enabled" first by using "xrandr ... --auto". Afterwards it is possible to really turn it off. Expected behavior: - LVDS stays off after resume when it was off before Sidenote: If the displays are configured the other way round (VGA off/LVDS on) a suspend/resume cycle does not enable the VGA output.
Comment 3 pittipatti 2009-11-06 02:43:27 UTC
Created attachment 31011 [details] xrandr query after resume
Comment 4 Carl Worth 2009-11-06 12:45:04 UTC
Hi pittipatti, Do you happen to know if this bug was introduced in a recent kernel revision? If so, we may be able to bisect the kernel to find the bad commit. Thanks, -Carl
Comment 5 pittipatti 2009-11-07 02:39:44 UTC
I just tried different versions and found that this bug was introduced with version 2.6.31-rc3. With rc2 the LVDS stays of after resuming.
Comment 6 Carl Worth 2009-11-13 12:14:54 UTC
(In reply to comment #5) > I just tried different versions and found that this bug was introduced > with version 2.6.31-rc3. > With rc2 the LVDS stays of after resuming. Thanks for the additional information. This sounds like a bug that's in Jesse's area, (or if no he might know who can handle it best), so I'll assign it to him. -Carl
Comment 7 Jesse Barnes 2009-11-20 14:10:57 UTC
Ah yeah, we may force LVDS back on now that we listen for lid events (which are sometimes generated at resume). I'll have to come up with a better way of restoring the suspend config by ignoring spurious enables at resume.
Comment 8 Jesse Barnes 2010-02-05 14:42:03 UTC
Does this still occur with 2.6.33-rc kernels? We may need to add a quirk for your lid if it's generating spurious events. Please attached the output of dmidecode to this bug.
Comment 9 pittipatti 2010-02-06 05:07:56 UTC
I just tested with 2.6.33-rc6 and it just works fine, so the bug can be closed. for the sake of completeness I'll however attach the dmidecode info.
Comment 11 Jesse Barnes 2010-02-06 10:28:16 UTC
Thanks for the update.