Public bug reported:
Since kernel 4.1 laptop HP Elitebook Folio 1040 G1 (with Intel i5-4210U)
has a pretty issue with flickering
Symptoms:
1) If I leave mouse cursor for a few seconds, then start moving it, there's
slight flicker (like display brightness changes a bit)
2) On the top left corner sometimes appears artifacts. It's relatively easy to
see with black window decorations on top of the screen. This one is showed at
the attached video bellow
3) With kernel boot options
drm.debug=0x1e log_buf_len=4M
dmesg shows constant refresh rate changes (even if it's set to 40HZ)
[ 29.977378] [drm:intel_dp_set_drrs_state [i915]] eDP Refresh Rate set to :
40Hz
[ 30.456537] [drm:intel_dp_set_drrs_state [i915]] eDP Refresh Rate set to :
60Hz
[ 33.973392] [drm:intel_dp_set_drrs_state [i915]] eDP Refresh Rate set to :
40Hz
[ 35.055923] [drm:intel_dp_set_drrs_state [i915]] eDP Refresh Rate set to :
60Hz
nomodeset boot option eliminates flickering
Turns out Display Refresh Rate Switching (DRRS) feature doesn't work
correctly here. It was implemented on kernels 4.0...4.1 but on a
particular machine flickering started with 4.1.
As a workaround I'm attaching a patch which disables DRRS by default and
adds module parameter "enable_drrs" to activate it. It's made for kernel
5.12 and should work for older versions as well (tested with 5.11).
Until this issue is resolved, please consider adding parameter to
disable DRRS. Windows has such option on Intel® Graphics Command Center.
** Affects: linux
Importance: Unknown
Status: Unknown
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: 1040 flickering folio g1 hp i915
** Patch added: "Patch to disable DRRS by default with parameter to enable it"
https://bugs.launchpad.net/bugs/1928138/+attachment/5496449/+files/disable_drrs_by_default_5-12.patch
** Bug watch added: gitlab.freedesktop.org/drm/intel/-/issues #3441
https://gitlab.freedesktop.org/drm/intel/-/issues/3441
** Also affects: linux via
https://gitlab.freedesktop.org/drm/intel/-/issues/3441
Importance: Unknown
Status: Unknown
** Description changed:
Since kernel 4.1 laptop HP Elitebook Folio 1040 G1 (with Intel i5-4210U)
has a pretty issue with flickering
Symptoms:
1) If I leave mouse cursor for a few seconds, then start moving it, there's
slight flicker (like display brightness changes a bit)
2) On the top left corner sometimes appears artifacts. It's relatively easy
to see with black window decorations on top of the screen. This one is showed
at the attached video bellow
3) With kernel boot options
drm.debug=0x1e log_buf_len=4M
+
dmesg shows constant refresh rate changes (even if it's set to 40HZ)
[ 29.977378] [drm:intel_dp_set_drrs_state [i915]] eDP Refresh Rate set to :
40Hz
[ 30.456537] [drm:intel_dp_set_drrs_state [i915]] eDP Refresh Rate set to :
60Hz
[ 33.973392] [drm:intel_dp_set_drrs_state [i915]] eDP Refresh Rate set to :
40Hz
[ 35.055923] [drm:intel_dp_set_drrs_state [i915]] eDP Refresh Rate set to :
60Hz
nomodeset boot option eliminates flickering
Turns out Display Refresh Rate Switching (DRRS) feature doesn't work
correctly here. It was implemented on kernels 4.0...4.1 but on a
particular machine flickering started with 4.1.
As a workaround I'm attaching a patch which disables DRRS by default and
adds module parameter "enable_drrs" to activate it. It's made for kernel
5.12 and should work for older versions as well (tested with 5.11).
Until this issue is resolved, please consider adding parameter to
disable DRRS. Windows has such option on Intel® Graphics Command Center.
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https://bugs.launchpad.net/bugs/1928138
Title:
Flickering on built-in display (Intel Haswell graphics) since kernel
v4.1 [bissected and workaround attached]
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