[Bug 73567] New: [915 Haswell ULT Asus UX302LA/LG] eDP bpp clamping results in blank screen
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Mon Jan 13 10:23:05 PST 2014
https://bugs.freedesktop.org/show_bug.cgi?id=73567
Priority: medium
Bug ID: 73567
CC: intel-gfx-bugs at lists.freedesktop.org
Assignee: intel-gfx-bugs at lists.freedesktop.org
Summary: [915 Haswell ULT Asus UX302LA/LG] eDP bpp clamping
results in blank screen
QA Contact: intel-gfx-bugs at lists.freedesktop.org
Severity: normal
Classification: Unclassified
OS: Linux (All)
Reporter: albaguirre at gmail.com
Hardware: x86-64 (AMD64)
Status: NEW
Version: unspecified
Component: DRM/Intel
Product: DRI
Created attachment 91970
--> https://bugs.freedesktop.org/attachment.cgi?id=91970&action=edit
Test ignoring bpp clamping
I have an ASUS UX302LA laptop running Ubuntu 14.04 daily build. I've switched
the kernel to the latest drm-intel-nightly from here:
http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-nightly/current/)
Any sequence that turns off/on the panel (suspend/resume, modesetting) results
in a blank screen.
I narrowed it down to the clamping code in intel_dp.c after going through this
old bug thread (see attached patch)
https://bugzilla.kernel.org/show_bug.cgi?id=59841
When ignoring the clamping - no blank screen issues occur.
The hack implemented in intel_dp.c:
commit c6cd2ee2d59111a07cd9199564c9bdcb2d11e5cf
Author: Jani Nikula <jani.nikula at intel.com>
Date: Mon Oct 21 10:52:07 2013 +0300W
drm/i915/dp: workaround BIOS eDP bpp clamping issue
Is not effective on the UX302LA/LG - from logs it looks like
intel_dp_get_config is never called - any idea why?
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