From mboxrd@z Thu Jan 1 00:00:00 1970 From: Larry Finger Date: Thu, 10 Feb 2011 11:41:57 -0600 Subject: LP PHY Dell device not working properly with b43 even in PIO mode In-Reply-To: <20110210181642.760948f3@destiny.ordissimo> References: <20110210181642.760948f3@destiny.ordissimo> Message-ID: <4D542365.6060307@lwfinger.net> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: b43-dev@lists.infradead.org On 02/10/2011 11:16 AM, Anisse Astier wrote: > [ 103.627184] wlan0: associated > [ 103.677583] b43-phy0 debug: Using hardware based encryption for keyidx: 0, mac: 68:7f:74:16:57:c9 > [ 148.586756] b43-phy0 ERROR: Fatal DMA error: 0x00000800, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000 > [ 148.586788] b43-phy0 ERROR: This device does not support DMA on your system. It will now be switched to PIO. > [ 148.586791] b43-phy0: Controller RESET (DMA error) ... > [ 148.586794] b43-phy0 ERROR: Fatal DMA error: 0x00000800, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000 > [ 148.586797] b43-phy0 ERROR: This device does not support DMA on your system. It will now be switched to PIO. > [ 148.586800] b43-phy0: Controller RESET (DMA error) ... > [ 148.586882] b43-phy0 debug: Wireless interface stopped On some boxes, 14e4:4315 devices fail in b43 with with this DMA error. We don't know why, nor do we know how to fix it. Unfortunately, none of the developers have such a system, which makes the debugging harder. I don't think the problem is with the Dell 1397, but with the motherboard on the laptop. In fact, most of the problems have been with netbook computers with a Phoenix BIOS. Does your system fit that description? > [ 297.703041] b43-phy0 ERROR: MAC suspend failed > [ 297.854043] b43-phy0 ERROR: MAC suspend failed > [ 298.003042] b43-phy0 ERROR: MAC suspend failed Are the MAC suspend failures in PIO mode a regression that recently appeared? I cannot think of any changes that should have affected the LP PHY devices, but anything is possible. The only workaround I can suggest is to use wl. I hate to recommend closed-source software, but there may be no alternative. Larry