<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [SKL][Linux] : Xrandr is not working as expected" href="https://bugs.freedesktop.org/show_bug.cgi?id=91562#c18">Comment # 18</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [SKL][Linux] : Xrandr is not working as expected" href="https://bugs.freedesktop.org/show_bug.cgi?id=91562">bug 91562</a> from <a class="email" href="mailto:tvrtko.ursulin@linux.intel.com" title="Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>"> Tvrtko Ursulin</a> <pre>(In reply to Chris Wilson from <a href="show_bug.cgi?id=91562#c17">comment #17</a>) > (In reply to Tvrtko Ursulin from <a href="show_bug.cgi?id=91562#c16">comment #16</a>) > > (In reply to Chris Wilson from <a href="show_bug.cgi?id=91562#c15">comment #15</a>) > > > (In reply to Tvrtko Ursulin from <a href="show_bug.cgi?id=91562#c14">comment #14</a>) > > > > Created <a href="attachment.cgi?id=118122" name="attach_118122" title="ddx debug log in Y tiling mode">attachment 118122</a> <a href="attachment.cgi?id=118122&action=edit" title="ddx debug log in Y tiling mode">[details]</a> > > > > ddx debug log in Y tiling mode > > > > > > > > With the DDX rebuilt to default to Y tiling, this logs shows that when > > > > "xrandr -o left" it abandons the Y tiled FB and goes back to X tiled. > > > > > > It sets the rotation, and then the kernel rejects the setcrtc and so it is > > > forced to use a shadowfb, X without rotation, and perform manual rotations > > > (using the GPU of course!) from the Y-tiled frontbuffer to the X-tiled > > > framebuffer. > > > > Does it try to go Y tiled when attempting to rotate, in the default build? > > It's tricky. The buffer cannot be exported and Y-tiling is so much slower > for common operations that I am not convinced it is worth it. It is possible > for the client to provide a Y-tiled buffer that we will then use. But since > the setcrtc failed... So basically the reported black screen has nothing to do with hardware rotation, since hardware rotation is not supported since it requires Y tiling which the DDX won't attempt. And either way, since I could not reproduce the black screen, someone else will have to provide full debug logs for that case. > > Interestingly in the Y tiled build there seems to be a path where it doesn't > > use fb modifiers ("[drm:intel_framebuffer_init] No Y tiling for legacy > > addfb"). > > Right, during the start up it tests whether the interface is deliberately > broken. I am pretty sure I've seen it when requesting rotation, not on startup.</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>