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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Regression BDW] backlight flickering/display artifacting on Broadwell integrated graphics with 4.12-rc1"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101111#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [Regression BDW] backlight flickering/display artifacting on Broadwell integrated graphics with 4.12-rc1"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101111">bug 101111</a>
from <span class="vcard"><a class="email" href="mailto:nicholas.stommel@gmail.com" title="Nicholas Stommel <nicholas.stommel@gmail.com>"> <span class="fn">Nicholas Stommel</span></a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=131420" name="attach_131420" title="The folllowing patch seems to fix the issue!">attachment 131420</a> <a href="attachment.cgi?id=131420&action=edit" title="The folllowing patch seems to fix the issue!">[details]</a></span> <a href='page.cgi?id=splinter.html&bug=101111&attachment=131420'>[review]</a>
The folllowing patch seems to fix the issue!
Ah, it was as I expected. The following patch appears to fix the issue! It
looks like these exact same lines from the previous bug I filed at
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [bdw regression 4.8] Severe graphics regression, rainbow glitching and flickering on Intel Broadwell 5500U integrated graphics"
href="show_bug.cgi?id=97918">https://bugs.freedesktop.org/show_bug.cgi?id=97918</a> has come back to haunt us in
a weird way. But the fix seems to really work!
--- a/drivers/gpu/drm/i915/intel_opregion.c 2017-05-13 16:19:49.000000000
-0400
+++ b/drivers/gpu/drm/i915/intel_opregion.c 2017-05-19 22:44:29.891397327
-0400
@@ -1021,23 +1021,6 @@
return err;
}
-static int intel_use_opregion_panel_type_callback(const struct dmi_system_id
*id)
-{
- DRM_INFO("Using panel type from OpRegion on %s\n", id->ident);
- return 1;
-}
-
-static const struct dmi_system_id intel_use_opregion_panel_type[] = {
- {
- .callback = intel_use_opregion_panel_type_callback,
- .ident = "Conrac GmbH IX45GM2",
- .matches = {DMI_MATCH(DMI_SYS_VENDOR, "Conrac GmbH"),
- DMI_MATCH(DMI_PRODUCT_NAME, "IX45GM2"),
- },
- },
- { }
-};
-
int
intel_opregion_get_panel_type(struct drm_i915_private *dev_priv)
{
@@ -1063,15 +1046,5 @@
return -ENODEV;
}
- /*
- * So far we know that some machined must use it, others must not use
it.
- * There doesn't seem to be any way to determine which way to go,
except
- * via a quirk list :(
- */
- if (!dmi_check_system(intel_use_opregion_panel_type)) {
- DRM_DEBUG_KMS("Ignoring OpRegion panel type (%d)\n", ret - 1);
- return -ENODEV;
- }
-
return ret - 1;
}</pre>
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