[Bug 111095] New: Backlight flicker after suspend on certain Intel CherryTrail tablets
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Tue Jul 9 12:51:07 UTC 2019
https://bugs.freedesktop.org/show_bug.cgi?id=111095
Bug ID: 111095
Summary: Backlight flicker after suspend on certain Intel
CherryTrail tablets
Product: DRI
Version: unspecified
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: major
Priority: medium
Component: DRM/Intel
Assignee: intel-gfx-bugs at lists.freedesktop.org
Reporter: russianneuromancer at ya.ru
QA Contact: intel-gfx-bugs at lists.freedesktop.org
CC: intel-gfx-bugs at lists.freedesktop.org
Created attachment 144739
--> https://bugs.freedesktop.org/attachment.cgi?id=144739&action=edit
drm-tip dmesg with drm.debug=0x1e from Irbis TW90
Hello!
I find that backlight is flicker after suspend on certain Intel CherryTrail
tablets. In particular, I reproduced this issue on Irbis TW90 and Lenovo Miix
320-10ICR. There is few ways of reproducing this issue, none is 100% reliable,
but in general it boiling down to several suspend/wakeup cycles for a period of
few hours. In attached Irbis TW90 log issue happened after two suspend/wakeup
cycles, every suspend lasted for a ~3 hours.
Other symptoms:
1. When backlight flicker occur brightness adjustment to 10-20% level makes
screen completely black (backlight is disabled). This doesn't happen before
suspend.
2. When backlight flicker occur brightness adjustment to 100% allow to
temporary workaround issue at cost of battery time.
3. Reboot or power cycle usually doesn't help. When backlight flicker started
it continue to happen everywhere, even in BIOS.
Logs from drm-tip/2019-07-05 (ad5a0afdd20635e644d13406e1d1a7ec44398e0e) with
drm.debug=0x1e from both devices is attached.
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