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Regression in 5.11 on Ivy Bridge

Hello,

I am running xorg-x11-server 1.20.3, Mesa 20.2.4, Firefox 78.9. Booting the same system with 5.3.18 and 5.11.15 leads to different behavior of GL. While 5.3.18 works as expected, 5.11.15 has artifacts (5.12-rc8 also).

5.3.18 shows GL as expected:

The sample of GitHub main page opened in Firefox with 5.3.18

5.11.15 has some artifacts (as well as 5.12-rc and drm-tip):

The sample of GitHub main page opened in Firefox with 5.11.15

I use the following model of Intel integrated video:

00:02.0 0300: 8086:0152 (rev 09)
Edited by Matwey V. Kornilov
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