http://bugzilla.kernel.org/show_bug.cgi?id=11541
------- Comment #68 from d.be...@gmail.com 2009-03-03 03:15 ------- (In reply to comment #67) > > and in powernow-k8 not supporting (by now) voltage scaling but only > > frequency > > scaling. > Either powernow-k8 can do both, frequency and voltage scaling, or it does not > work at all. Why do you think frequency scaling is broken? Can you provide > dmesg output when loading the powernow-k8 driver. powernow-k8 works, but I think it doesn't support all of the hardware scaling features: e.g. minimum frequency in Linux is 600MHz while in Windows it is 550MHz (maybe northbridge scaling? maybe something related to voltage? I don't know, I'm no expert, just making some hypotheses) Here is dmesg output for powernow-k8 module insertion [ 19.919509] powernow-k8: Found 1 AMD Turion(tm) X2 Ultra Dual-Core Mobile ZM-82 processors (2 cpu cores) (version 2.20.00) [ 19.919622] powernow-k8: 0 : pstate 0 (2200 MHz) [ 19.919700] powernow-k8: 1 : pstate 1 (1100 MHz) [ 19.919737] powernow-k8: 2 : pstate 2 (600 MHz) > Are you sure the battery lifetime regression comes from then new BIOS or could > it be that it is related that you run a newer kernel now? There is no regression in battery lifetime: in Linux it always had been of about 1hr (with or without MTRRs). I think this is not related to BIOS or kernel version, but on how some hardware is managed (again, scaling working but at higher frequencies than in Windows and maybe second video card not deactivating while on battery) > > some issue in handling the power state of the second video card > Hmm, mtrr and video card are more related, how this can influence power > savings, I have no idea. This laptop has two video cards: an integrated Ati HD3200, intended to be used when on battery and a discrete HD3650 (HD3450 for M51Tr), intended to be used on AC. With Linux, at least by now, the integrated card is always used, but I don't know if the HD3650 chip is properly turned off or it drains power even if not used. This may be a reason for poor battery life issue. > Is there a changeset about the BIOS modifications? According to http://www.asustreiber.de/downloads/file/1167-m51taas-207 the changelog for bios 207 is: * Fix the fan don't normal work after s3 resume in the power saving mode. * Update external VGA VBIOS to BR030816.001 to fix 3D mark will hang with Hynix VRAM. > Anyway running the latest binary graphics driver may improve things I have not tested yet after the bios upgrade, but unfortunately recent fglrx releases either crash my Xorg or have other issues preventing me to use them (now I'm using the quite old fglrx 8.7 or radeon open-source driver depending on needing 3d acceleration or kernel-with-wireless-working). I'll try them again ASAP, as the bios changelog seems to update video bios too. -- Configure bugmail: http://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is. ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ acpi-bugzilla mailing list acpi-bugzilla@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/acpi-bugzilla
