http://bugzilla.opensuse.org/show_bug.cgi?id=939607 http://bugzilla.opensuse.org/show_bug.cgi?id=939607#c2 Takashi Iwai changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |peter@rmk2.org, | |tiwai@suse.com Flags| |needinfo?(peter@rmk2.org) --- Comment #2 from Takashi Iwai --- Could you check whether 4.2-rc kernel still has the same problem? The kernel package is available in OBS Kernel:HEAD repo. If it's still not fixed, we should report this to upstream, either at bugzilla.freedesktop.org or bugzilla.kernel.org. It would be best if you can create a bug entry there. Feel free to put me to Cc, so that I can provide a test kernel or backport the fix quickly. Thanks. -- You are receiving this mail because: You are on the CC list for the bug.

http://bugzilla.opensuse.org/show_bug.cgi?id=939607 http://bugzilla.opensuse.org/show_bug.cgi?id=939607#c4 Peter Hanisch changed: What |Removed |Added ---------------------------------------------------------------------------- See Also| |https://bugs.freedesktop.or | |g/show_bug.cgi?id=91451 --- Comment #4 from Peter Hanisch --- One of the Arch people had already filed a bug report on freedesktop.org, so we can probably piggyback on that: https://bugs.freedesktop.org/show_bug.cgi?id=91451 -- You are receiving this mail because: You are on the CC list for the bug.

http://bugzilla.opensuse.org/show_bug.cgi?id=939607 http://bugzilla.opensuse.org/show_bug.cgi?id=939607#c6 --- Comment #6 from Peter Hanisch --- Apologies for the long silence, I wasn't near my regular desktop setup and therefore could not test the proposed solutions! drm_kms_helper.dp_aux_i2c_transfer_size works for 1, 2 & 4 (i.e. the external monitor/dongle is recognised correctly and works as it should), but not for 8, where the behaviour reverts back to the one that spawned this bugreport in the first place. This MacBook Air has a Haswell CPU as well, by the way, specifically an i7-4650U. -- You are receiving this mail because: You are on the CC list for the bug.

http://bugzilla.opensuse.org/show_bug.cgi?id=939607 http://bugzilla.opensuse.org/show_bug.cgi?id=939607#c8 --- Comment #8 from Takashi Iwai --- Also, could you check whether the patch below helps? -- You are receiving this mail because: You are on the CC list for the bug.

http://bugzilla.opensuse.org/show_bug.cgi?id=939607 http://bugzilla.opensuse.org/show_bug.cgi?id=939607#c10 --- Comment #10 from Peter Hanisch --- Applying your patch to the current 4.1.4 kernel and starting without specifying drm_kms_helper.dp_aux_i2c_transfer_size works, i.e. the external monitor/dongle show up correctly. However, unlike the kernel parameter, it seems the resolution on the external monitor during boot and on the (kdm) login screen seems to be off. My external monitor has a native resolution of 1400x1050, but everything before logging in looks more like 1024x768 or some such. Nevertheless, it fixes the original problem! -- You are receiving this mail because: You are on the CC list for the bug.

http://bugzilla.opensuse.org/show_bug.cgi?id=939607 http://bugzilla.opensuse.org/show_bug.cgi?id=939607#c12 --- Comment #12 from Peter Hanisch --- That's correct, the low resolution does not happen with dp_aux_i2c_transfer_size=4 both on an (unpatched) 4.1.2 and the patched 4.1.4 kernel, whereas it does happen on the patched 4.1.4 kernel without any parameters. -- You are receiving this mail because: You are on the CC list for the bug.

http://bugzilla.opensuse.org/show_bug.cgi?id=939607 http://bugzilla.opensuse.org/show_bug.cgi?id=939607#c14 Takashi Iwai changed: What |Removed |Added ---------------------------------------------------------------------------- Attachment #644134|0 |1 is obsolete| | --- Comment #14 from Takashi Iwai --- Created attachment 644192 --> http://bugzilla.opensuse.org/attachment.cgi?id=644192&action=edit Revised test patch -- You are receiving this mail because: You are on the CC list for the bug.