[Bug 108514] heavy screen flickering with Mobility Radeon X1600 and kernel version onwards 3.13

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108514

--- Comment #13 from Paul Dufresne <dufresnep at gmail.com> ---
I am comparing PLL values for a not flickering kernel:
Linux version 3.14.79-031479-generic
and version 4.15 (recent one):

Linux 4.15:
Flickering values
[    5.554557] [drm:radeon_compute_pll_avivo [radeon]] 122000 - 121980, pll
dividers - fb: 253.0 ref: 8, post 7
[  465.773119] [drm:radeon_compute_pll_avivo [radeon]] 122000 - 121980, pll
dividers - fb: 253.0 ref: 8, post 7
[  503.796178] [drm:radeon_compute_pll_avivo [radeon]] 122000 - 121980, pll
dividers - fb: 253.0 ref: 8, post 7

Linux version 3.14.79-031479-generic: no flickering
[4.250932] [drm:radeon_compute_pll_avivo], 12201, pll dividers - fb: 189.8 ref:
6, post 7
[  230.376566] [drm:radeon_compute_pll_avivo], 12201, pll dividers - fb: 189.8
ref: 6, post 7

122000 is about 10x 12201
I don't know what are these values, but it seems very different!

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