On Tue, 2014-12-23 at 03:24 +0100, John Paul Adrian Glaubitz wrote: > On 12/23/2014 02:48 AM, Ben Hutchings wrote: > > This change caused a regression for some other 32-bit PowerMacs the > > last time we tried it (#614221). Therefore I limited it to 64-bit > > PowerPC configurations. > > Thanks for the hint! Interestingly, the linked bug report mentions that > the bug showed on the Mac Mini G4 model as well [1] which is the exact > model which I am testing on (G4 CPU, Radeon 9200 graphics). > > Also, as far as I know, the iBook G4 that you tested as well as my Mac > Mini G4 share exactly the same hardware, minus the display. So I am > quite confident the results should be the same. I believe backlight control was broken when using KMS, so I am less confident about that. I no longer have the iBook G4 so can't test it again. > > I am not going to make any further changes to this, until someone > > can show a solution that will not reintroduce that regression. > > Alright, which hardware configurations do you want me to test? As I said > during DebConf, I might be able to lend some G3/G4 Macs from people at > my department and run some tests on them. > > In any case, we need to be able to use the radeon KMS driver as Radeon > X.Org driver that ships with Jessie does no longer support UMS, so > anyone using the 32-bit kernel on a PowerPC will have poor graphics > performance either way. That is still better than having no display if the backlight is not correctly controlled. > I will try to get into touch with the people from the #614221 bug > report. They should be able to test whether the regression still > exists by simply adding "video=radeonfb:off" on a testing/sid > system. Thanks. Ben. > Adrian > > > [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=614221#39 > -- Ben Hutchings Editing code like this is akin to sticking plasters on the bleeding stump of a severed limb. - me, 29 June 1999
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