Hello Jonas, 06.09.2018 16:01, Jonas Ådahl wrote: > Mutter should already handle falling back on plain mode sets if flipping > failed.
Not sure if I was quite clear. We do not support flipping at all, and it is the mode set which fails. It looks to me (am I right?) like Mutter does not handle that. In my case continuing to use the old mode would make sense, but I don't know whether this would make sense in other situations. On the other hand, my case is presumably the only known one where it is a problem at all. > I'd suggest opening a issue (on > https://gitlab.gnome.org/GNOME/mutter/issues/new) with reproduction > steps etc. A question however > (to answer in the reported issue) is why a subsequent mode flip fixes > things if the first one failed to too little video RAM? What fixes it is triggering another mode switch to a smaller mode. It is quite easy to send hotplug events with any given preferred size in VirtualBox. Thanks and regards Michael > Jonas > > On Thu, Sep 06, 2018 at 11:43:46AM +0200, Michael Thayer via gnome-shell-list > wrote: >> Hello, >> >> Hans (on CC) asked me to file a bug for this, but I wanted to ask on the >> mailing list first in case I am misreading the code. We have been >> looking at a problem where GNOME Shell on a VirtualBox guest with the >> Additions video driver becomes unusable when a mode set operation fails >> (due to too little video RAM allocated). A further successful mode set >> cures things. It seems to me that this is due to Mutter failing to >> check the return value of meta_gpu_kms_flip_crtc() and assuming that the >> mode set succeeded. Does that sound likely? In case it is helpful to >> know, the video driver still does not support either atomic or page flips. >> >> Regards >> Michael >> -- >> Michael Thayer | VirtualBox engineer >> ORACLE Deutschland B.V. & Co. KG | Werkstr. 24 | D-71384 Weinstadt >> >> ORACLE Deutschland B.V. & Co. KG >> Hauptverwaltung: Riesstraße 25, D-80992 München >> Registergericht: Amtsgericht München, HRA 95603 >> >> Komplementärin: ORACLE Deutschland Verwaltung B.V. >> Hertogswetering 163/167, 3543 AS Utrecht, Niederlande >> Handelsregister der Handelskammer Midden-Nederland, Nr. 30143697 >> Geschäftsführer: Alexander van der Ven, Jan Schultheiss, Val Maher > >> pub rsa3072 2018-06-26 [SC] [expires: 2019-06-26] >> 00474F6447A79D8998B7542123F0CF2E68CC7371 >> uid Michael Thayer <michael.tha...@oracle.com> >> sub rsa3072 2018-06-26 [E] [expires: 2019-06-26] > >> _______________________________________________ >> gnome-shell-list mailing list >> gnome-shell-list@gnome.org >> https://mail.gnome.org/mailman/listinfo/gnome-shell-list > -- Michael Thayer | VirtualBox engineer ORACLE Deutschland B.V. & Co. KG | Werkstr. 24 | D-71384 Weinstadt ORACLE Deutschland B.V. & Co. KG Hauptverwaltung: Riesstraße 25, D-80992 München Registergericht: Amtsgericht München, HRA 95603 Komplementärin: ORACLE Deutschland Verwaltung B.V. Hertogswetering 163/167, 3543 AS Utrecht, Niederlande Handelsregister der Handelskammer Midden-Nederland, Nr. 30143697 Geschäftsführer: Alexander van der Ven, Jan Schultheiss, Val Maher
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