[Bug 105469] New: i915 always chooses the alternate fixed display mode on the eDP

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105469

            Bug ID: 105469
           Summary: i915 always chooses the alternate fixed display mode
                    on the eDP
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: rune at megahurts.dk
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 138047
  --> https://bugs.freedesktop.org/attachment.cgi?id=138047&action=edit
The content of /var/log/debug when booting with drm.debug=0xe

No matter what display mode you select with xrandr, the i915 driver will always
select the alternate fixes mode.
For me this means that the display will always run at 40Hz which is quite
annoying.

if you intel_edp_compare_alt_mode() to also compare 'vrefresh' then it is
possible to select both fixed_mode(60Hz)
(the fix is mentioned in https://bugs.freedesktop.org/show_bug.cgi?id=103497)
Then 60Hz will be selected all the time no matter what display mode is
selected.

Distro: Debian
Kernel: 4.15.4(custom)
Machine: HP ZBook 15 G4 Mobile Workstation.

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