[Bug 87682] Horizontal lines in radeon driver on kernel 3.15 and upwards

[bugzilla-daemon at bugs.freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87682

--- Comment #17 from Chris Bainbridge <chris.bainbridge at gmail.com> ---
Christian König posted an explanation of the PLL divider values at
https://bugzilla.kernel.org/show_bug.cgi?id=91861#c12 (another "no screen after
3.15" bug report)

The various fixes adjust the divider value limits slightly for different
displays. The basic formula is commented in the radeon_compute_pll_avivo
function:

        dot_clock = (ref_freq * feedback_div) / (ref_div * post_div)

So by adjusting the limits of those values you can find something that works
for your laptop display. But I don't know which solution is technically correct
- if you don't get a reply here you could try emailing Christian König and
asking.

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/dri-devel/attachments/20160510/8cb9c99a/attachment-0001.html>