<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [CI] igt@kms_color@pipe-[abc]-*gamma - fail - CRC mismatch" href="https://bugs.freedesktop.org/show_bug.cgi?id=104782#c22">Comment # 22</a> on <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [CI] igt@kms_color@pipe-[abc]-*gamma - fail - CRC mismatch" href="https://bugs.freedesktop.org/show_bug.cgi?id=104782">bug 104782</a> from <a class="email" href="mailto:uma.shankar@intel.com" title="Uma Shankar <uma.shankar@intel.com>"> Uma Shankar</a> <pre>This is happening on ICL+ due to multi segmented gamma being enabled. Reason is due to pipe roundup and interpolation, the crc values goes off and doesn't match exactly. This results in the tests to fail, however this is expected and no visual artifacts are observed. This matched in 10 bit gamma cases, because the precision was slightly low and hence 2 input values which though not equal got same result after LUT lookup due to interpolation (slightly different inputs yielded same value on lookup). However with multi segmented gamma, we have more precision and higher number of samples. The exact same input values got mapped to different values on LUT lookup. This caused crc's to mismatch. There is no functional issue, and we may have to re-design the test methodology to avoid relying on crc matches for these tests.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>